Codes on Alerts and Indicators

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Alert code Meaning
Alarm A high priority alert requiring immediate attention and action.
Alert An announcement of abnormal situations and conditions requiring attentions.
Caution Lowest priority of an alert. Awareness of a condition which does not warrant an alarm or warning condition, but still requires attention out of the ordinary consideration of the situation or of given information.
Warning Condition requiring immediate attention, but not immediate action.

Source: IMO Res. A1021(26)

(VTS40, IALA Guideline no. 1110 refers)